TB1--1520--238--20--118
NOTE
SThe stabilator position must be in "horizontal" position to avoid contact and dam-
age with the lift supporting the X--ray tube.
SX--ray procedures are allowed for blade positioning off the aircraft. If the blade
is not installed on the aircraft, position the tail rotor blades using lead--shot bags
or equivalent while maintaining the inspection surface perpendicular to the X--ray
beam.
(11) Position the X--ray tube head for exposure.
(a) Using a "line level", level the X--ray tube by placing the line level on the upper surface of
the case and adjusting.
(b) Extend a string from the center of the X--ray port to the rivet identified for the central radi-
ation ray as shown in Figure 4. Using the line level on the string, make any height adjustments to the
X--ray tube as necessary to perform a basic level test set--up.
(c) Using the laser and mirror set--up in Figure 5 and Figure 6, make any rotation and height
adjustments necessary to achieve a perpendicular laser reflection. The laser should strike the mirror in
close proximity to the rivet identified for "central ray" location.
(12)Maintain focus of the X--ray beam determined with laser for exposure E1 and E2.
(13)Set X--ray unit to the values given in Table 1.
(14)Make E1 and E2 exposures to cover both 301 stainless steel and aluminum areas.
Radiographic Inspection Data
Exposure
KV
MA
FFD (inches)
Time (sec)
Film Type
Film Size
Film
No.
Processing
E1
130
5
48
4 min 20 sec
M
4 1/2 X 10
Manual
E2
130
5
48
2 min 30 sec
M
4 1/2 X 10
Manual
E1
130
5
48
2 min
M
4 1/2 X 10
Auto
E2
130
5
48
1 min 20 sec
M
4 1/2 X 10
Auto
Remarks:
1. The film density of the area of interest shall be between 1.6 to 3.7 H&D units. See Figure 2 for film
density points to be taken.
2. Exposure time may be changed as required to achieve density, reference TM 1--1500--335--23.
3. Development of film should be conducted in a dry, cool, temperate enviroment, preferably in condi-
tioned air.
Table 1
f. Recurring 250 hour Tail Rotor Blade inspections will be conducted IAW SOF AH--64--01--05, para-
graph 8, TM 1--1520--238--23, IETM and this TB. This inspection will be accomplished by Level III or equiva-
lent personnel trained in performance of this inspection.
(1) If a Level III or equivalent person trained in performance of this inspection is available, inspec-
tion may be completed locally. If additional interpretation of radiographs is required, contact the technical
POC in paragraph 16a.
(2) If a Level III or equivalent person trained in the performance of this inspection is not available,
trained N2 radiographers may make X--ray shots. X--Rays or blades from units without certified Level III radi-
ographers trained in the Tail Rotor Blade inspection procedure and approve by the AMCOM Non--Destructive
Test Center of Excellence (NDT COE) will be sent to: NonDestructive Test Center of Excellence, USAAM-
COM, AMSAM--DSA--AS--AG (NDT COE S.Ratley), Redstone Arsenal, AL 35898--5000.
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